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Thermophysics and Aeromechanics

2005 year, number 4

Statistical theory of nanoparticle transport processes in gases and liquids (Review)

V.Ya. Rudyak, A.A. Belkin, and S.L. Krasnolutskii
Novosibirsk State University of Civil Engineering, Novosibirsk, Russia
Pages: 489-507

Abstract >>
The paper statistically treats nanoparticle transport processes in gases and liquids. We show that nanoparticle transport in rarefied gases can be predicted based on the Boltzman kinetic equations involving a special interaction potential of carrier-gas molecules with the particle. Data on nanoparticle diffusivity versus nanoparticle size and solvent temperature are presented. Mechanisms of nanoparticle relaxation in dense gases and liquids are described. It is shown that the main nanoparticle relaxation mechanism in liquids is the interaction of nanoparticles with microfluctuations of solvent velocity and density fields. For the first time, data on the interaction forces acting on nanoparticles in gases and liquids are reported.

Gas-dynamic aspects of the contamination problem at the International Space Station. 3.

V.N. Yarygin1, V.G. Prikhodko1, I.V. Yarygin1, Yu.I. Gerasimov2, and A.N. Krylov2
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Korolev Rocket and Space Corporation
Pages: 509-516

Abstract >>
We present the results of experimental and numerical studies of different gas-dynamic protectors developed to decrease the back flows of contaminating fractions at orientation thrusters of the spacecraft.

Investigation of localized energy deposition effect on streamwise vortex interaction with an oblique shock

A.A. Zheltovodov and E.A. Pimonov
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Pages: 517-537

Abstract >>
The results of numerical investigations of the streamwise vortex interaction with an oblique shock whose flow inclination angle b = 23.3

Riblet-assisted control of transformation of the L-structure into a turbulent spot

V.G. Chernorai 2, Yu.A. Litvinenko1, V.V. Kozlov1, L. Loefdahl2, G.R. Grek1, and H.H. Chun3
1Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
2Chalmer Institute of Technology, Goeteborg, Sweden
3Pussan National University, South Korea
Pages: 539-548

Abstract >>
Experimental results are presented on transformation of a solitary L-structure into a turbulent spot and control of this process by means of riblets on the wetted surface in the boundary layer on a flat plate. It is shown that riblets exert a stabilizing effect on transformation of the L-structure into a turbulent spot. The L-structure on a smooth surface is shown to stretch in the streamwise direction and transform into a hairpin vortex, which becomes a turbulent spot further downstream. The intensity of the L-structure on riblets first increases and then decays further downstream, reaching less than half its value on a smooth surface. Finally, the L-structure decays on riblets without forming a turbulent spot.

Complex analysis of turbulence models, algorithms, and grid structures at the computation of recirculating flow in a cavity by means of VP2/3 and FLUENT packages. Part 1. Scheme factors influence

S.A. Isaev1, P.A. Baranov1, N.A. Kudryavtsev1, D.A. Lysenko1, and A.E. Usachov2
1Saint-Petersburg State University of Civil Aviation, Russia
2TsAGI n. a. N.E.
Pages: 549-569

Abstract >>
A joint testing of the specialized (VP2/3) and universal (FLUENT) packages of the applied programs of hydrodynamic and thermophysic structure is carried out on the basis of the solution of a known benchmark test on recirculating flow of a viscous incompressible fluid in a square lid-driven cavity. The Reynolds-averaged Navier

Analytic-form solution of the equation for vortex motion of viscous gas in the ice cylinder

O.G. Kudelin and O.N. Lebedev
Novosibirsk State Academy of Waterborn Traffic, Novosibirsk, Russia
Pages: 571–576

Abstract >>
An analytic solution is found for a boundary-value problem of vortex motion of viscous gas in the cylinder of an internal combustion engine (ICE) with flat piston geometry at the compression stroke. An analytic solution has been determined for the angular velocity component in a cylindrical coordinate system with a refining polynomial, which reduces to a system of nonlinear algebraic equations after its substitution into the model equation, the initial and several boundary conditions. By virtue of the uniqueness of the solution of the boundary-value problem under study, the angular velocity component is found from the obtained values of the constants of the refining polynomial at a given point of the internal cylinder space. The obtained solution is compared with experimental data.

Incompressible fluid flow in a short vortex chamber with hyperbolic walls

V.V. Sorokin
Joint Institute of Power and Nuclear Research
Pages: 577–583

Abstract >>
The method was developed for calculation of incompressible fluid flow through a short vortex chamber with hyperbola-shaped walls. Calculations are close to experimental data. Properties of flows are compared in chambers with hyperbolic and flat walls. In a chamber with hyperbolic walls the effect of friction on the flow is found to be stronger than for a flat-wall analog.

Numerical investigation of a forced air exchange process in a room

I.V. Kostolomov and A.G. Kutushev
Tyumen State Academy of Civil Engineering, Tyumen, Russia
Pages: 585–596

Abstract >>
The results of mathematical modelling of aerodynamic thermal processes in the rooms are presented for several schemes of the air supply and removal. The model rooms having the shape of a cube are considered, inside which there are or there are no obstacles and heat sources. The equations of a steady three-dimensional isothermal or non-isothermal gas motion corresponding to the k-ε- turbulence model are used to describe the thermal and aerodynamic processes. The similarity criteria are found for the processes of the heat and air exchange. Basing on them, a detailed numerical investigation of the influence of determining parameters of the problem on the local and averaged characteristics of the velocity and temperature fields has been carried out.

The effect of gas phase dispersibility on characteristics of bubbly downflow

O.N. Kashinsky, V.V. Randin, P.D. Lobanov, and G.V. Bogoslovtsev
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Pages: 597-603

Abstract >>
Results of investigating a co-current bubbly downflow in a vertical tube of the 20-mm inner diameter are presented. The two-phase flow was formed using a special mixer, which allows variation of gas bubble sizes. Void fraction, liquid phase velocity and its pulsation were measured by the electrochemical method. In comparison with a single-phase flow, it was noted that turbulent pulsations of liquid velocity in the two-phase flow are considerably suppressed. A significant effect of dispersed composition of a gas phase on average and pulsation flow characteristics was demonstrated.

Gas injection into porous reservoir saturated with gas and water

V.Sh. Shagapov1, N.G. Musakaev2, and M.K. Khasanov1
1Sterlitamak State Pedagogical Academy, Sterlitamak, Russia
2Tyumen Branch of Khristianovich Institute of Theoretical and Applied Mechanics SB
Pages: 605-616

Abstract >>
Gashydrate formation in a gas- and water-saturated reservoir due to gas injection into the bed is examined. Self-similar solutions to the planar one-dimensional problem are constructed, which give the distribution of main bed characteristics. It is found that, depending on injected-gas parameters, the gashydrate forms either at a frontal surface or in an extended region.

Numerical investigation of hydrophysical processes at the matching of different non-isothermal filtration models of two-phase liquid

O.B. Bocharov1 and I.G. Telegin2
1Lavrentiev Institute of Hydrodynamics SB RAS, Novosibirsk, Russia
2Institute of Water and Environmental Problems SB RAS, Novosibirsk, Russia
Pages: 617-626

Abstract >>
The problem of matching the non-isothermal models of Muskat

Study of phase equilibria and estimates of thermodynamic properties in binary borate systems

A.B. Meshalkin
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Pages: 627-641

Abstract >>
Phase transitions in binary borate systems were studied by the oscillation method of phase analysis; thermodynamic properties of melts were calculated. Measurements were carried out for several systems: Li2O-B2O3, Na2O-B2O3, K2O-B2O3, Rb2O-B2O3, Cs2O-B2O3, and BaO-B2O3. abstract_eng||The melting temperature was measured accurately, and the types of melt-ing for the systems were specified. The composition of crystallized phase and compounds depends on the thermal prehistrory of samples. The melt viscosity was estimated for all systems. For binary systems in the framework of subregular solution we calculated thermodynamic properties of melts and enthalpy for compounds with congruent melting. There exists a correlation between the dissociation degree of a compound and the melt supercooling before the spontaneous.

Thermochemical cathodes in arc plasmatorches

A.S. An’shakov, E.K. Urbakh, A.E. Urbakh, and V.A. Faleev
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Pages: 643-648

Abstract >>
Results of experiments with thermochemical cathodes made on the basis of hafnium and zirconium are presented. Data on heat fluxes to an electrode and its erosion depending on the arc current allowed an estimate of the service life of hafnium cathode in oxygen-bearing media. The scheme of cathode with four thermoemission insertions was suggested and implemented for a significant prolongation of cathode operation in comparison with a single-insertion cathode.

Experimental study of power characteristics of two-tier Savonius rotor

D.N. Gorelov
Omsk Branch of Sobolev Institute of Mathematics SB RAS, Omsk, Russia
Pages: 649-652

Abstract >>
Experiments were carried out with a two-tier Savonius rotor with optimal proportions of geometry parameters. The testing was performed in a tow basin with almost zero effect of flow boundaries. The positive net power is generated for the specific speed varying from zero to one, and the maximum of the wind energy utilization coefficient is 20 %.